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题库 / GMATLA-CR-13
The percentage of households with an annual income of more than $40,000 is higher in Merton county than in any other county. However, the percentage of households with an annual income of $60,000 or more is highest in Sommer county.
If the statements above are true, which of the following can properly be concluded on the basis of them?
No household in Merton county has an annual income of $60,000 or more.
Some households in Merton county have an annual income between $40,000 and $60,000.
The number of households with an annual income of more than $40,000 is greater in Merton than in Sommer county.
Average annual household income is higher in Sommer than in Merton county.
The percentage of households with an annual income of $80,000 is higher in Sommer than in Merton county.
集合知识
收入8以上的人只是收入6以上的人的集合中的一个子集，你不能说包含了这个子集的集合比另一个更大，这个子集就比另一个集合的子集更大吧？
子集的大小由子集的具体数值得来，在这里表现为百分比，要知道这个百分比的大小你至少需要知道收入8以上的人的具体数值和总量，而这两个信息都是未知的，所以收入8以上的人所占百分比未知，大小也未知。
该题只有B和题干信息之间有或然性关系，其他的全部无关。
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